Mining pick



p 0, 1966 P. BELUGOU MINING PICK Filed June a. 1964 United States Patent3,273,940 l /flNlNG PICK Pierre Belugou, Paris, France, assignor toCharbonnages de France, Paris, France, a pnhiic institution of FranceFiled June 8, 1964, Ser. No. 373,391 Claims priority, applicationFrance, June 20, 1963, 938,804, Patent 1,358,318 3 Claims. (Cl. 29981)It is known that, during the work of mining a mineral substance, amining tool, for example an .auger pick or a coalcutter knife, givesrise to the production of fine dust.

Numerous devices are already known which permit this disadvantage to beovercome, these making use of the radial projection of jets of waterduring the operation of the mining machine, these jets being directedtowards a zone located close to the cutting edge of the tool, either infront or on each side of this edge.

These devices are not always as effective as may be desired. In fact,they facilitate the agglomeration of the dust which is raised, and thuscause the blocking of the Water intake channels and the choking of thetool.

The present invention has for its object to produce a mining picksuitable for all kinds of machines such as coalcutting machines orboring machines, this pick being associated with a system of waterinjection of such a kind that the whole arrangement ensures adistribution of Water which is more effective than those known at thepresent time, without blockingup or choking.

The pick according to the invention is characterized in that itcomprises a waterintake channel delivering perpendicularly into aspraying channel bored straight through the body of the pick.

In accordance with another characteristic feature, the water intakechannel comprises a nozzle discharging into the spraying channel, thesaid nozzle having a smaller section that that of the spraying channel.

According to a further characteristic feature, the spraying channel iscylindrical at its middle and comprises a divergent portion at each ofits extremities.

Accordingly to an advantageous feature, the cylindrical portion of thespraying channel is reduced to a length which is less than its diameter.

In an advantageous form of embodiment, the water intake channel isformed by a bore pierced longitudinally in the body of the pick, thespraying channel being pierced transversely in the head of the pick inthe vicinity of the cutting edge.

In accordance with a further feature, the spraying channel isperpendicular to the direction of cutting of the pick, and its axis islocated on the neutral axis of the pick.

Further characteristic features and advantages will be come apparentfrom the description which follows below, reference being made to theaccompanying drawings, in which:

FIG. 1 is a section of a pick according to the invention taken along itsplane of symmetry.

FIG. 2 is an end view with partial cross-section taken along a planeperpendicular to that preceding.

The water to be sprayed is distributed by the member (not shown) whichcarries the picks, a drum or an anger for example, by any device knownper se and engaging in the extremity '11 of a waterintake channel 1pierced in the body of the pick 2.

The other extremity 1-2 of the channel 1 is a nozzle of small diameterwhich is provided for the purpose of accelerating and spraying the jetof water. The nozzle 12 delivers into a bore 3. The spraying of the jetof water is accentuated by the impact of the jet of water against thesurface 4 of the bore 3, and by the presence of two lateral milledportions '31 and 32.

The water is discharged from the pick in the form of tiny dropstravelling at high speed, and these droplets are dispersed to the rearof the cutting edge of the pick in a zone in which the dust isconcentrated. In this way, the dust is forced against the walls of thegroove cut by the pick but does not collect in front of the cutting edgeof the pick.

In order to eliminate with certainty all risk of blockingu-p the bore 3,there is an advantage, during the milling of the orifices 31 and 32, inreducing the length of the bore 3 to a value less than its diameter. Bythis means, the particles having a diameter greater than or equal tothat of the bore 3 cannot pass into it, and the other particles onlyhave an extremely short time of passage through the bore 3, so that theyare not able to become agglomerated during their passage through thisbore.

On the other hand, it should be observed that the circulation of waterin the pick also has the advantage of cooling the head.

It would still remain within the scope of the invention to modify theform or the arrangement of the waterintake and spraying channels, themeans of distribution of Water by the member supporting the picks, theform and the arrangement of the lateral orifices of the sprayingchannel, this list and also the description having been given only byway of explanation and not in any limitative sense.

I claim:

1. An improved mining pick associated with a Waterinjection device, saidpick comprising: a water-intake conduit discharging perpendicularly intoa spraying conduit pierced right through the body of said. pick, andspraying conduit having a cylindrical middle portion which has a lengthless than its diameter and a divergent portion at each extremity of saidspraying conduit; a nozzle on said intake conduit, and discharging intosaid spraying conduit, said nozzle having a section smaller than that ofsaid spraying conduit.

2. A mining pick as claimed is claim 1, in which said water-intakeconduit is constituted by a passage bored longitudinally in the body ofsaid pick, said spraying conduit being bored transversely in the head ofsaid pick in the vicinity of the cutting edge of said pick.

3. A mining pick as claimed in claim 11, in which said spraying conduitis perpendicular to the cutting direction of said pick, and the axis ofsaid conduit is located on the neutral axis of the pick.

References Cited by the Examiner UNITED STATES PATENTS 2,008,768 7/1935Neal 29981 X 2,191,699 2/1940 Stephens 175418 X 2,320,610 6/ 1943 Kandle17539-3 X 2,619,054 11/1952 Bell 111-7 3,092,190 6/ 1963 Gruere l394 XERNEST R. PURSER, Primary Examiner.

1. AN IMPROVED MINING PICK ASSOCIATED WITH A WATERINJECTION DEVICE, SAIDPICK COMPRISING: A WATER-INTAKE CONDUIT DISCHARGING PERPENDICULARLY INTOA SPRAYING CONDUIT PIERCED RIGHT THROUGH THE BODY OF SAID PICK, ANDSPRAYING CONDUIT HAVING A CYLINDRICAL MIDDLE PORTION WHICH HAS A LENGTHLESS THAN ITS DIAMETER AND A DIVERGENT PORTION AT EACH EXTREMITY OF SAIDSPRAYING CONDUIT; A NOZZLE ON SAID INTAKE CONDUIT, AND DISCHARGING INTOSAID SPRAYING CONDUIT, SAID NOZZLE HAVING A SECTION SMALLER THAN THAT OFSAID SPRAYING CONDUIT.